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    // 冒泡排序[2,4,1,22,15,56,90,23,4,1]
    let arr = [2, 4, 1, 22, 15, 56, 90, 23, 4, 1]
    for (let i = 0; i < arr.length - 1; i++) {
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        if (arr[j] >= arr[j + 1]) {
          let a = arr[j]
          arr[j] = arr[j + 1]
          arr[j + 1] = a
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